Abstract: An improvement is provided in a safety pressure relief device adapted to be installed between a standard base flange and a standard hold-down flange including a first crowned rupture member, a second crowned rupture member, a resilient sealing membrane, the resilient sealing membrane being positioned between the first crowned member and the second crowned member, the first crowned member being positioned with respect to the second crowned member with its convex side away from the second crowned member, the convex side of the second crowned member being away from the first crowned member, both the first and second crowned members being perforate to allow pressure fluids to pass therethrough to be exerted against the sealing member, and means securing the first crowned rupture member and the second crowned rupture member to the resilient sealing member.